Most of the time you'll never have to worry about having to install a new operating system on your Mac - the one that's on there should work fine through thick and thin. But every once in a while you might want or need to - here are step by step instructions for making it happen. Use Recovery Mode Every Mac operating system since Lion (OS X 10.7) has included Recovery Mode, a special boot partition that enables you to recover from catastrophic failures and problems. This can be used to install a fresh copy of Mavericks on your hard drive, provided you have Internet access. To use Recovery Mode, follow these instructions: • Shut down your Mac. • Press the Power button (the button marked with a O with a 1 through it) • Immediately press the command (cloverleaf) key and R together. • Make sure you're connected to the internet through Wi-Fi.

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Install the best available HP print driver and software on your Mac using Apple Software Update. Before installing the software, turn on the printer and make sure it is connected to the computer you want to print or scan from, either with a USB cable or through your local Wi-Fi or wired network. How to install a fresh copy of OS X on your Mac. Select Install Mac OS X, then click Continue. It's worth noting that this installs a fresh copy of OS X on your Mac without affecting either your files or your user settings, so you should be good to go as soon as it reboots. All applications are maintained, as well.

If you're not, choose a network from the Wi-Fi menu that appears at the top-right corner of the screen. • Select Install Mac OS X, then click Continue.

Important: If the update didn't start, didn't complete or there was some other problem, you can go to the Systems & Languages page to download and install the latest version of Firefox for your system and language or you can use this download link (see How to download and install Firefox on Windows Install Firefox on Linux How to download and install Firefox on Mac for more information). For instructions, see Install an older version of Adobe Reader on Mac OS. When the file appears at the bottom of the browser, click the file. (If you don't see the file, choose Downloads from the Chrome menu.). Follow the instructions below to download and install Adobe Acrobat Reader DC on Windows. Mac users: If you're running Mac OS, see Install Adobe Acrobat Reader DC on Mac OS. System requirements.

It's worth noting that this installs a fresh copy of OS X on your Mac without affecting either your files or your user settings, so you should be good to go as soon as it reboots. All applications are maintained, as well. This system simply replaces the core files that enable OS X to operate. I've had occasion to see systems that don't work with Recovery Mode, for some reason. For those computers, it's often possible to restore access to the Recovery Mode partition by resetting the System Management Controller (SMC). To reset the SMC on most Macs: • Shut down the Mac. If it's a laptop, make sure it's connected to the power cord.

• Hold down the Control, Option, and Left Shift keys simultaneously, then press the Power button. • Release the keys. • Press the Power button again. The system should turn on and you can give Recovery Mode another try. If that fails to work, you can always download a fresh copy of the Mavericks installer from the Mac App Store.